Metallic bobbin for photographic or like films



Dec. 15 1925-.

G. E. LEFEBVRE METALLIC BOBBIN FOR PHOTOGRAPHIC 0R LIKE FILMS Filegi Aqg 19. 1924 Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

GEORGES EUGENE LEFEBVRE, OF JOINVILLE-LE-PONT, FRANCE, ASSIGNOB TO PATHE CINEMA, ANCIENS ETABLISSEMENTS PAIHE FBERES, 0F PARIS, FRANCE.

ME'I ALLIQBOBBIN FOR PHOTOGRAPHIC OR LIKE FILMS.

Application filed August 19, 1924. Serial No. 732,929.

To all whom it may concem:

Be it known that I, GEORGES EUGENE LEFEBVRE, citizen of the French Republic, residing at- Joinville-le-Pont, Seine, in the Republic of France, have invented new and useful Improvements in Metallic Bobbins for Photo raphic or like Films, of which the following is a specification.

The present invention relates to a metallic bobbin for photographic films. According to the invention, said bobbin consists of a metal tube obtained by the bending of a suitably punched plate, and of two fiat metal discs each disposed at an end of the said tube and thus forming the checks or endpieces of the bobbin. The said cheeks are secured to the tube by the engagement of tongues, formed upon both ends of the said tube, in apertures in the said discs, the end of each tongue being held under a cut-out or struck-out portion of the corresponding disc, these struck-out portions being then flattened down in order to provide a plane surface for the discs.

To provide for the attaching of the end of the film to be wound upon the bobbin, one longitudinal edge of the said metal plate is driven, by stamping, towards the interior of the tube, and the projection which has been formed upon this edge during the punching of the said plate will serve as a guide when inserting the end of the film or the paper band attached to the latter. The tub is also provided on the opposite edge with a longitudinal slot having its inner edge also driven towards the interior, this slot cooperating with the said projection to provide for the attaching of the end of the film.

centre with a circular hole, whilst the other is pierced with an elongated aperture adapted to receive the key which serves to rotate One of the discs or cheeks is pierced atits Furthermore, the aperture serving to receive the winding keyis such that the rotation of the bobbin will be made in a very reliable manner.

The appended drawing shows, by way of example, a bobbin constructed in accordance with the invention and illustrates the different stages of its manufacture.

Fig. 1 is a plan view of the metal plate or blank used for the construction of the tube, said plate being pierced near one longitudinal edge with a longitudinal slot which will serve to attach one end of the film; the projection which is adapted to guide this end of the film is shown in the form which is given to it by stamping and bending before rolling up said blank.

Fig. 2 is a perspective view of one end of the tube before the corresponding cheek being attached thereto.

Fig. 3 is a view similar to Fig. 2,-but in axial section. v

Fig. 4 is an alvial section showing the engagement of the tongues in the said cheek.

Fig. 5 shows the succeeding operation wherein the ends of the tongues are engaged in the cut-out or struck-out portions of the checks;

Fig. 6 is a sectional view showing the piece after the attaching is completed.

Fig. 7 is a perspective view of the completed bobbin.

Fig. 8 is a cross section on a larger scale on the line AA of Fig. 7. The mixed lines show the end of the film or-its attached paper band. engaged with the bobbin before the winding.

Fig. 9 is a section on the line BtB of Fig. 7, showing the aperture in the cheek in which the winding key is engaged.

In the form of construction shown in the drawings, it is observed that the bobbin comprises a metal tube 1 which is formed by rolling up a suitably stamped plate (Fig. 1) of suitable shape, provided at the two lateral sides constituting the ends of the tube with tongues 2 and on one of the longitudinal sides with the projection 1.

To one end of the tube 1 is secured the disc or cheek 3 and to the other end the disc or cheek 4. This fixation being done by first engaging the said tongues 2 in corresponding holes 5 in the said cheeks (Fig. 4). Then the tongues 2 are bent down upon the corresponding cheek by engaging the end of each tongue into a cut-out or struck-out portion 6 tain the corresponding bent down tongue.

The check 3 is pierced with a circular v aperture 7 in which is engaged a supporting axle for the bobbin, and the cheek 4 is pierced with an elongated aperture 8 into which will be engaged the key which will serve to rotate the bobbin upon its longitudinal axis for winding up the film. This aperture 8 may be punched in the said check, or preferably it may be punched to form the circular part as shown in Fig. 9, the radial parts being punched so as to form ,the two lugs 8, these being bent at 90 towards the interior the said lugs constitute a better bearing for the winding key, and will obviate all failures in the turning of the bobbin by means of the said key, in particular, in

, case the flat pin of the apparatus should not into contact with each other (Fig. 8).

continue as far as the upper part of the key; all danger of the loose turning of the key in the tube without rotating the latter will thus be obviated.

The end 9 of the firm itself. or of the paper band surrounding the film for attaching purposes, is mounted upon the bobbin as shown inFig. 8. This end is engaged on the one hand in the slot 10 formed between the adjacent longitudinal edges of the plate constituting the said tube, and on the other hand in the longitudinal slot 11 pierced in the wallof the tube. To facilitate the insertion of the end 9 of the film or the paper into the said slots, the extension 1 of the plate and the edge 11 of the slot are driven towards the interior of the tube, for instance by stamping and come substantiallIy should further be observed that the projection 1* serves as a guide for the end of the paper or the film and provides for a braking of the pa er or the film in the slot, which is I comparab e to the braking obtained with the neeaeeo bobbins having wooden axles, this affording greater safety in the rotating of the film. The two longitudinal edges of the metal plate in the parts which are not provided with the projection 1* are brought into contact with each other according to a generatrix of the tube.

Obviously, any suitable number of tongues 2, situated at the ends of the tube 1, may be employed.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: i

1. A bobbin for photographic films, comprising in combination a metallic 'tube formed b a blank cylindrically bent so as to bring its Yongitudinal edges into contact, two metallic discs forming the checks of the bobbin and being provided with a central aperture and circularly disposed slots, tongues being struck up in the metal of said discs close to said slots, the transverse edges of said blank being provided with tongues that are engaged into said slots and under the tongues of the said discs, and the latter tongues being forced down upon the tongues of the blank, the whole being driven down flush with the surface of the discs.

2. A bobbin for photographic films, comprising in combination a metallic tube formed by a blank cylindrically bent so as to bring its longitudinal edges into contact, two metallic discs forming the cheeks of the bobbin and being provided with a central aperture and circularly disposed slots, the transverse edges of said blank being provided with tongues that are engaged into said slots and bent down upon said discs whereby connecting firmly the latter to said tube, and a leading passage for the film or for the priming paper attached thereto limited on one side by the inner face of a por tion of said tube and on the other side by two jointed tongues forming a continuous surface, one of these tongues being formed by an extension inwardly bent of one longitudinal edge of the tube and the other tongue being formed by one edge inwardly bent of a slot in the blank.

In testimony whereof I have signed my name to this specification. 

